The Hydro-Sponge Pro is the newest product line among our family. The Hydro-Sponge Pro like the Hydro-Sponge is made in all the same sizes but unlike the Hydro-Sponge line it uses reticulated foam. This gives the sponge itself almost double the efficiency as compared to the Hydro-Sponge.

The Hydro-Sponge PRO aquarium filters provides both mechanical and biological filtration. Aerobic bacteria colonize the sponge, providing a bacterial substrate to facilitate the nitrogen cycle. In addition, the Hydro-Sponge traps larger waste particles, mechanically cleaning the water without trapping the baby fish.

Four Sizes Available:

- Hydro Sponge PRO II, up to 20 gal.

- Hydro Sponge PRO III, up to 30 gal.

- Hydro Sponge PRO IV, up to 80 gal.

- Hydro-Sponge PRO V, up to 120 gal.

Sponge Sizes:

SPONGE #2 Size: 4.25" H x 2.75" W

SPONGE #3 Size: 4.25" H x 3.75" W

SPONGE #4 Size: 4.5" H x 4.5"

SPONGE #5 Size: 4.5" H x 5.25" W

Hydro Sponge PRO Aquarium Filters

The Hydro-Sponge Pro is the newest product line among our family. The Hydro-Sponge Pro like the Hydro-Sponge is made in all the same sizes but unlike the Hydro-Sponge line it uses reticulated foam. This gives the sponge itself almost double the efficiency as compared to the Hydro-Sponge.

The Hydro-Sponge PRO aquarium filters provides both mechanical and biological filtration. Aerobic bacteria colonize the sponge, providing a bacterial substrate to facilitate the nitrogen cycle. In addition, the Hydro-Sponge traps larger waste particles, mechanically cleaning the water without trapping the baby fish.

Four Sizes Available:

- Hydro Sponge PRO II, up to 20 gal.

- Hydro Sponge PRO III, up to 30 gal.

- Hydro Sponge PRO IV, up to 80 gal.

- Hydro-Sponge PRO V, up to 120 gal.

Sponge Sizes:

SPONGE #2 Size: 4.25" H x 2.75" W

SPONGE #3 Size: 4.25" H x 3.75" W

SPONGE #4 Size: 4.5" H x 4.5"

SPONGE #5 Size: 4.5" H x 5.25" W

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Great Sponge Filters Review by KOSMOS

Product Rating:

These filters are great. I have multiple IV sponges on flowerhorn tanks and could not be happier. Cleaning is really easy. These do not break down and are very durable. I highly recommend these filters if you are planning to use sponge filters. (Posted on 3/7/2017)

best sponge filters Review by Laurie

Product Rating:

When looking for any quality or hard to find aquarium item online AquaCave usually has what I'm looking for. Recently I purchased Hydro sponge filters and although I had to return them,which went satisfactorily, Hydro sponge filters are one of the very best sponge filters you can find. Ordering from aquacave was a friendly experience and they were very helpful.I will be getting the fluval e series 50w heater from them next!
( another item not easy to find places that sell them online and/ or in my local pet stores) (Posted on 10/17/2016)

Great as a prefilter for a canister! Review by Danny

Product Rating:

I have this running on the intake of my HW-304b canister filter. It works great, doesn't restrict flow, keeps small fry out of my filter and cuts down on filter maintenance considerably. I just squeeze the sponge out weekely with my water changes. (Posted on 9/29/2014)

Great Product Review by David

Product Rating:

The Hydro V sponge is huge, almost too big for my tank. That means a lot of surface area though. Great economical way to add extra bio filtration to your tank. (Posted on 9/13/2014)

Hydro Sponge PRO Review by Van

This is the first time I use Hydro Sponge as my main filter and it is very surprised me. The water is super clean in the second week running. My angels frys will not stuck in there and the final is no one can beat aquacave. (Posted on 8/17/2010)

Love it! Review by Shoua

At first I order some Pro replacement filter for my other sponge filter that I have but the regular Sponge Filter II was too small IMO.

They work GREAT!!! Hyrdo filters are a MUST for any breeder, or community fish aquarists. They are quiet, and are extremely easy to clean. If you are looking for a great internal filter that is inexpensive, then hydro sponge filters is a great solution. I have them in all of my tanks, and they keep my tanks and water conditions stable. I HIGHLY rec. these filters. (Posted on 5/10/2010)